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Finding the Third Proportional to 129 and 214.50

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Solution

The third proportional to 129 and 214.50 is: 356.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 214.50 = 214.50 : x
  2. Step 2: Convert to fraction form
    129/214.50 = 214.50/x
  3. Step 3: Cross multiply
    129x = 214.50 × 214.50
  4. Step 4: Simplify right side
    129x = 46,010.25
  5. Step 5: Solve for x
    x = 46,010.25/129
  6. Step 6: Final answer
    x = 356.67

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.